This year marks the centennial of quantum mechanics—the theory that shattered our classical understanding of reality. Between 1925 and 1927, a series of breakthroughs fundamentally redefined matter, predictability, and the very limits of knowledge. The four pivotal documents on display highlight work in theoretical physics that transformed our relationship with reality. The same ideas now power lasers, MRI machines, and computers. Quantum theory reshaped how we understand—and live within—the world.